I was doing housecleaning in the 25K gal, blowing sediment out of the liner folds and saw something small dart out at one point. To my dismay it was a second crayfish! I've no idea how they survive surrounded by predators. Now that I took out most rocks, it decided to hide in the liner folds, I guess. So it has gone into Lucky's 240 gal for now. We'll call it Lucky2. The original Lucky was adopted by a family of friends and rules a 2 gal tank in style at their place.